Population Demographics for Rock County, Wisconsin in 2020, 2019
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| | Male | Female | Total | | Total Population | 78,815 | 81,516 | 160,331 | | White | 68,768 | 71,745 | 140,513 | | Hispanic or Latino | 6,363 | 5,761 | 12,124 | | Black or African American | 4,006 | 3,972 | 7,978 | | Some Other Race | 3,163 | 2,785 | 5,948 | | Two or More Races | 1,858 | 1,849 | 3,707 | | Asian | 720 | 910 | 1,630 | | American Indian | 282 | 234 | 516 | | Three or more races | 88 | 106 | 194 |
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| Total population in Rock County | | | Total Population: | 160,331 | | Male Population: | 78,815 | | Female Population: | 81,516 |
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| Median age in Rock County | | | Both sexes | 38 | | Male | 36 | | Female | 39 |
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| Population in households in Rock County | | | Total Population: | 157,397 | | Male Population: | 77,344 | | Under 5 years: | 5,384 | | 5 to 9 years: | 5,709 | | 10 to 14 years: | 5,783 | | 15 to 17 years: | 3,634 | | 18 and 19 years: | 2,019 | | 20 years: | 816 | | 21 years: | 848 | | 22 to 24 years: | 2,612 | | 25 to 29 years: | 4,893 | | 30 to 34 years: | 4,985 | | 35 to 39 years: | 5,089 | | 40 to 44 years: | 5,403 | | 45 to 49 years: | 5,940 | | 50 to 54 years: | 5,911 | | 55 to 59 years: | 5,103 | | 60 and 61 years: | 1,726 | | 62 to 64 years: | 2,325 | | 65 and 66 years: | 1,259 | | 67 to 69 years: | 1,698 | | 70 to 74 years: | 2,344 | | 75 to 79 years: | 1,762 | | 80 to 84 years: | 1,203 | | 85 years and over: | 898 | | Female Population: | 80,053 | | Under 5 years: | 5,059 | | 5 to 9 years: | 5,403 | | 10 to 14 years: | 5,628 | | 15 to 17 years: | 3,532 | | 18 and 19 years: | 1,854 | | 20 years: | 819 | | 21 years: | 780 | | 22 to 24 years: | 2,714 | | 25 to 29 years: | 5,121 | | 30 to 34 years: | 4,920 | | 35 to 39 years: | 5,191 | | 40 to 44 years: | 5,542 | | 45 to 49 years: | 6,079 | | 50 to 54 years: | 6,010 | | 55 to 59 years: | 5,238 | | 60 and 61 years: | 1,856 | | 62 to 64 years: | 2,544 | | 65 and 66 years: | 1,405 | | 67 to 69 years: | 1,953 | | 70 to 74 years: | 2,695 | | 75 to 79 years: | 2,209 | | 80 to 84 years: | 1,814 | | 85 years and over: | 1,687 |
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| Average household size in Rock County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Rock County | | | Total: | 62,905 | | Family led homes: | 42,416 | | Husband-wife family: | 31,157 | | Other family: | 11,259 | | Population of male led with no wife present: | 3,502 | | Population female led with no husband present: | 7,757 | | Population of Nonfamily homes: | 20,489 | | Population living alone: | 16,529 | | Population not living alone: | 3,960 |
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| Total occupied homes in Rock County with people under 18 years old: | | | Total: | 62,905 | | Population of homes with one or more people under 18 years: | 21,170 | | Population of family homes: | 20,845 | | Husband-wife family: | 12,944 | | Under 6 years only: | 2,765 | | Under 6 years and 6 to 17 years: | 2,899 | | 6 to 17 years only: | 7,280 | | Other family: | 7,901 | | Male householder, no wife present: | 2,321 | | Under 6 years only: | 580 | | Under 6 years and 6 to 17 years: | 400 | | 6 to 17 years only: | 1,341 | | Female led with no husband present: | 5,580 | | Under 6 years only: | 1,317 | | Under 6 years and 6 to 17 years: | 1,158 | | 6 to 17 years only: | 3,105 | | Nonfamily households: | 325 | | Male led households: | 262 | | Under 6 years only: | 59 | | Under 6 years and 6 to 17 years: | 20 | | 6 to 17 years only: | 183 | | Female led householder: | 63 | | Under 6 years only: | 20 | | Under 6 years and 6 to 17 years: | 4 | | 6 to 17 years only: | 39 | | Households with no people under 18 years: | 41,735 | | Family households: | 21,571 | | Husband-wife family: | 18,213 | | Other family: | 3,358 | | Male led with no wife present: | 1,181 | | Female led with no husband present: | 2,177 | | Nonfamily households: | 20,164 | | Male led householder: | 9,335 | | Female led householder: | 10,829 |
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| Total number led homes in Rock County, by type | | | Total Home Population: | 62,905 | | Population of Family homes: | 42,416 | | Population of 15 to 24 year olds: | 1,358 | | Population of 25 to 34 year olds: | 6,972 | | Population of 35 to 44 year olds: | 9,221 | | Population of 45 to 54 year olds: | 9,804 | | Population of 55 to 59 year olds: | 4,118 | | Population of 60 to 64 year olds: | 3,346 | | Population of 65 to 74 year olds: | 4,507 | | Population of 75 to 84 year olds: | 2,452 | | Population of 85 year olds and over: | 638 | | Population of Nonfamily Homes: | 20,489 | | Population of 15 to 24 year olds: | 1,236 | | Population of 25 to 34 year olds: | 2,579 | | Population of 35 to 44 year olds: | 2,305 | | Population of 45 to 54 year olds: | 3,829 | | Population of 55 to 59 year olds: | 2,084 | | Population of 60 to 64 year olds: | 1,748 | | Population of 65 to 74 year olds: | 2,675 | | Population of 75 to 84 year olds: | 2,597 | | Population of 85 year olds and over: | 1,436 |
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| households in Rock County containing people over 60 | | | Total Population: | 62,905 | | Population of homes with one or more people 60 years and over: | 20,815 | | 1-person household: | 7,920 | | 2-or-more-person household: | 12,895 | | Family households: | 12,244 | | Nonfamily households: | 651 | | Population of homes with no people 60 years and over: | 42,090 | | 1-person household: | 8,609 | | 2-or-more-person household: | 33,481 | | Family homes: | 30,172 | | Nonfamily homes: | 3,309 |
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| homes in Rock County with multiple generations. | | | Total Population: | 62,905 | | Home has three or more generations: | 1,916 | | Home does not have three or more generations: | 60,989 |
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| Unmarried population in Rock County under 18 years old in homes | | | Total Population: | 40,111 | | Unmarried partner of home lead present: | 4,858 | | In family homes: | 4,525 | | Population of male led and male partner homes: | 60 | | Population of male led and female partner households: | 1,910 | | Population of female led and female partner households: | 108 | | Population of female led and male partner households: | 2,447 | | In nonfamily homes: | 333 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 289 | | Population of female led and female partner homes: | 9 | | Population of female led and male partner homes: | 34 | | No unmarried partner of home lead present: | 35,253 | | In family homes: | 35,139 | | Population of husband-wife family homes: | 25,426 | | Population of male lead with no wife present, family homes: | 1,992 | | Population of female lead with no husband present, family homes: | 7,721 | | In nonfamily homes: | 114 |
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| Population in families living in Rock County | | | Total Population: | 127,352 | | Population Under 18 years: | 39,085 | | Population 18 years and over: | 88,267 |
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| How long in Rock County have lived in one place. | | | Total: | 62,905 | | Population of Owner occupied homes: | 44,380 | | Family home: | 32,886 | | Nonfamily homess: | 11,494 | | Male led home: | 5,400 | | Living alone: | 4,096 | | Not living alone: | 1,304 | | Female led home: | 6,094 | | Living alone: | 5,256 | | Not living alone: | 838 | | Population of Renter occupied homes: | 18,525 | | Family run homes: | 9,530 | | Husband-wife family: | 3,950 | | Other family: | 5,580 | | Male led with no wife present: | 1,424 | | Female led with no husband present: | 4,156 | | Nonfamily Homes: | 8,995 | | Male led homes: | 4,197 | | Male living alone: | 3,181 | | Male not living alone: | 1,016 | | Female led homes: | 4,798 | | Females living alone: | 3,996 | | Females not living alone: | 802 |
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